1、 Equipment Overview:

1.1 Product Overview

The High and low temperature alternating humidity test chamber can be used to determine the adaptability of electronic products, automotive components, materials, etc. to use and store under high humidity, low humidity, constant high and low temperature rapid alternating cycles, and other conditions.

The High and low temperature alternating humidity test chamber adopts a relatively reasonable structure and stable and reliable control method, making it aesthetically pleasing, easy to operate, safe, and with high temperature and humidity control accuracy. It is an ideal equipment for conducting rapid temperature change tests, constant temperature and humidity tests, and alternating humidity tests.

1.2 Product Advantages and Technical Features

1.2.1 Utilize a multi-channel, environmentally friendly and energy-saving (low-noise) mechanical compression refrigeration system.

All materials, parts, components, raw materials, etc. of the high and low temperature alternating humidity test chamber, whether domestic or imported, shall be environmentally friendly products; Based on the characteristics of mechanical compression refrigeration, a two-stage multi-channel main and bypass system is adopted. The multi-channel main and bypass can be adaptively selected and activated according to different working conditions. The entire control is automatically implemented by an intelligent control system according to the working conditions, changing the traditional way of using a temperature controller to control the heater to offset the cooling capacity to control the cooling capacity. So as to achieve energy-saving effect, not only does the energy consumption account for only 80% of similar products. It also reduces the operating load of the refrigeration compressor, reduces equipment vibration and noise, and improves control accuracy. To achieve better energy-saving effects, frequency conversion technology is adopted to adapt the refrigeration output of the refrigeration compressor to various temperature change rate requirements in the laboratory, while controlling the power loss during use to achieve energy-saving effects. Use sound-absorbing and silencing methods in different parts of the entire structure and mechanical working process to reduce the overall noise of the equipment.

1.2.2. Independently developed multi-channel and multi-stage throttling system (refrigeration system).

The refrigeration system of the high and low temperature alternating humidity test chamber is designed with different capillary main and bypass paths according to different operating conditions. The capillary throttling system is automatically controlled and adjusted by the intelligent communication control system based on the operating conditions to ensure that the flow rate can be adjusted, achieving the purpose of temperature change. Moreover, the temperature field changes uniformly and the temperature fluctuation is minimal.

1.2.3. Apply a broadband compression balance temperature control system to achieve rapid temperature control through a fast convergence PID adaptive algorithm.

By using a temperature mixing chamber, a static pressure chamber, and a forced air duct system with centrifugal blades, sufficient exchange of cold and heat is ensured, and air is evenly supplied through the top orifice plate to each space in the working room (experimental area) to achieve temperature uniformity; To achieve rapid temperature convergence, our company has collaborated with Sanyuan Corporation in South Korea to develop a dedicated PID adaptive algorithm suitable for our company. This control method continuously adjusts the control according to the temperature situation during the control process, achieving the control objectives of fast sword retraction, small temperature overshoot, and high stability.

1.2.4 Implement remote visual control.

The high and low temperature alternating humidity test chamber is equipped with a human-machine management interface and a touch mode automation control system to achieve automatic control; At the same time, remote monitoring can be achieved by connecting to a remote computer through the RS485 communication interface. The entire system is controlled and managed through a graphical interface, which is simple and fast, with automatic fault prompts. The graphical prompts are energy-saving and provide solutions to guide users in quickly troubleshooting.

2、 Capacity, weight, size, and specifications

Product model GC-HH-500G

Sample restrictions: This testing equipment prohibits the testing of flammable, explosive, and volatile substance samples; Testing for storing samples of corrosive substances, testing for storing organisms, testing and storing samples of strong electromagnetic emission sources

Nominal internal volume 500L

The effective size of the inner box is 700 × 800 × 900 (mm) W × H × D

Exterior space approximately 950 × 1750 × 1600 (mm) W × H × D

Weight approximately 400kg

Work noise ≤ 75db measured at a distance of 1 meter in front of the machine and 1.2 meters above the ground

3、 Equipment power, current, and power supply

Maximum power of 12KW

Maximum current of 18A

Power supply conditions

And power supply

AC380V three-phase four wire system+protective grounding N; The allowable voltage fluctuation range is 10% V;

The allowable frequency fluctuation range is 50 ± 0.5HZ; TN-S power supply or TT power supply

The grounding resistance of the protective grounding wire is less than 4 Ω

Require users to configure corresponding capacity air or power switches for the equipment at the installation site, and this switch must be independently controlled. When placing powered samples in the equipment use box, please use an external power source for the sample power supply and do not directly use the local power supply;

4、 Main technical parameters of the equipment

Control accuracy temperature resolution: 0.1 ℃

Humidity resolution: 0.1% RH

Temperature deviation: ±1.0℃    

Humidity deviation ≤± 3% R.H. (≥ 75% R.H.) ≤± 5% R.H. (<75% R.H.)

Temperature uniformity: ≤ 2℃     

Humidity uniformity: ≤ 3%RH

Temperature fluctuation: ± 0.5 ℃

Humidity fluctuation: ± 2% RH

Temperature and humidity range Temperature range:- 70～+150℃

Humidity range: 20-98% RH (as shown in the figure)

Heating rate -70 ℃~+150 ℃ ≤ 60 min (unloaded: average throughout the entire process).

Cooling rate+20 ℃~-70 ℃ ≤ 60 min (unloaded: average throughout the entire process).

Note: The temperature uniformity and deviation are at an ambient temperature of+25 ℃ and a relative humidity of ≤ 85% R H、 The value measured under the condition of no sample.

Note: The heat absorption and release of aluminum ingots or equivalent benefit steel ingots with equipment load ≤ 30kg/m3

5、 The product meets the testing conditions and execution standards

1. GB2423.1-2008/IEC6008-2-1-2007 Part 2: Test Methods Test A: Low Temperature

2. GB/T 2423.2-2008 Part 2: Test Methods Test B: High Temperature

3. GJB150.3A-2009 High temperature test method

4. GJB150.4A-2009 Low temperature test method

5. GB2423.22-2008 Environmental testing for electrical and electronic products - Part 2: Test Nb: Temperature change with specified temperature change rate

6. GBT 2424.5-2006 Environmental Testing Temperature Test Chamber Performance Confirmation for Electrical and Electronic Products

7. GJB1032 Environmental Stress Screening Method for Electronic Products

6、 Equipment structure composition

The equipment layout control box and test box are integrated, with the test space located in the upper left corner of the equipment, the refrigeration machinery room located below the equipment, the electrical control box located in the upper right corner of the equipment, and the water supply box located in the lower right corner of the equipment

Sealing strip: Silicone sealing strip

The circulating fan is located at the top of the equipment test box

The test box door is installed in front of the test box, and an observation window is set on the door

Set a test hole at the center position on the left side of the device

Drainage holes, power cable holes, and power supply main switch are set up behind the equipment

Install mobile casters and positioning foot cups at the bottom of the box

The product storage rack is made of SUS304 # stainless steel punched and bent into a mesh shape, which is easy to use, and the spacing between material racks can be adjusted. Can bear a weight of over 100KG Place another shelf on the bottom layer, 5cm above the bottom of the inner box, to facilitate ventilation at the bottom of the product. Configure two pieces

The inner box is made of SUS304 # stainless steel plate, which is cut using precision laser cutting equipment and bent into shape using a CNC bending machine. It is then fully welded using argon arc welding, polished and finished; The steel plate is 1.2mm thick; There are sample rack trays on both sides of the inner box to support the indexing frame, and the spacing between sample racks can be adjusted

The outer box material is made of cold-rolled steel plate, cut by precision laser cutting equipment and bent into shape by CNC bending machine, and then welded, polished and made by argon arc welding; After the overall pickling and rust removal of the steel plate surface, the surface is treated with high-temperature baking paint. Compared with the usual surface spraying treatment, the appearance is more beautiful and elegant, and its anti-corrosion and rust prevention performance is enhanced; Steel plate thickness 1.2mm thick

The insulation material is made of polyurethane rigid foam and glass fiber cotton, with a thickness of 100mm. It has better insulation performance than ordinary insulation cotton, saving electricity and reducing the impact on the ambient temperature of the equipment

The air circulation system test sample is placed in the testing space, and it is necessary to ensure the uniformity of the surface temperature and humidity of the sample. The airflow in the testing space must be forcibly circulated. The equipment is equipped with a built-in air chamber, circulating air duct and stainless steel circulating fan. Through the top back leaf window and diffuser, the air is evenly blown out from the top, and the temperature and humidity in the mixing room are distributed to the test space, so as to achieve the purpose of evenly controlling the temperature and humidity

Box door single door, explosion-proof handle

Anti condensation electric heating device

Vacuum automatic defogging transparent window, window lighting

Insulation layer rigid polyurethane foam+glass fiber

Open one lead test hole& Phi; A 100mm test hole is provided, along with corresponding insulation fittings and specialized sealing plugs. The opening is located slightly above the center of the left side of the box. Conducive to conducting experiments with threading.

Observation window transparent electric heating film insulated tempered glass (located on the door) (with anti condensation function), size 270X360mm

Control panel imported from South Korea TEMI880 LCD touch programmable controller, adjustable over temperature protector, emergency stop button switch, lighting switch, main power switch, RS-232 communication interface

Refrigeration unit, cooling fan, drainage device, and refrigeration control accessories in the refrigeration machinery room

Distribution control cabinet main power circuit breaker, controller, distribution board, cooling fan, over temperature protector

The heating system adopts a scale heat dissipation heating tube P I. D controls heating to achieve temperature equilibrium

The heater is made of exposed spiral nickel chromium heating wire and insulated ceramic bracket, with low surface load, sensitive temperature control, and small temperature hysteresis.

Heater control mode: PID+PWM+ SSR， Solid state relays are used for contactless zero crossing triggering to drive heaters, with no contact sparks or noise, and a long service life.

7、 Refrigeration system

Imported high-precision pressure controller for measuring refrigeration pressure, measuring refrigeration pressure and sending pressure signals to the central controller

In order to ensure the cooling rate and minimum temperature requirements of the laboratory, a binary duplex refrigeration system is used in this laboratory. The duplex system includes a high-temperature refrigeration cycle and a low-temperature refrigeration cycle, and heat exchange is achieved through an evaporative condenser

The compressor adopts European imported French Taikang compressor

Cooling method: air-cooled scale condenser, cooling fan for heat dissipation

Evaporator finned tube heat exchanger

The evaporative condenser adopts a high-temperature copper brazed layout heat exchanger, which has a small surface area, low energy loss, and high heat transfer efficiency

Throttle device, thermal expansion valve, capillary tube

The programmable logic controller of the refrigeration machine control system automatically adjusts the operating conditions of the refrigeration machine according to the test conditions

Compressor return air cooling circuit

Energy pressure regulating valve

Fully imported refrigeration accessories

The refrigerant used is the environmentally friendly refrigerant R404a/R23 with an ozone depletion index of 0

Characteristics of refrigeration system

A、 The entire system pipeline undergoes a leak test with ventilation and pressure of 22kg.

B、 The heating and cooling systems are completely independent.

C、 Equipped with our company's professional technical features, it prevents damage to the system caused by high-temperature and high-pressure airflow in the same flow refrigeration unit.

D、 All freezing system action programs are completely controlled by a microcomputer controller.

E、 There is a water tray at the bottom of the compressor, which can collect the condensed water generated by frosting.

F、 The compressor is equipped with a PTC temperature sensor, which provides over temperature protection when the compressor exceeds the temperature limit.

G、 The compressor is equipped with an oil pressure protector to achieve oil pressure protection.

H、 The high and low pressure protection device monitors the pressure of the refrigerant during the operation of the equipment. Once the refrigerant pressure is higher than the system's limit pressure or lower than the minimum pressure set by the system, an alarm is immediately issued and the power is cut off until the fault is resolved.

I、 The refrigeration system uses imported brand accessories, which are reliable in quality and ensure the stability of the system.

8、 Electrical control system

Controller, controls temperature and humidity separately

LCD Touchscreen Controller TEMI880

Program capacity and available program quantity for control functions: up to 120 groups, one program can be combined from 1 to 99 segments

Usable memory capacity: 1200 segments, can execute commands repeatedly: each command can be executed up to 999 times, program slope can be set by the timeline, programs can be linked and used, and program creation adopts conversational operation with simple operation

Equipped with functions such as editing, clearing, and inserting, with 4 sets of time signal output control (controllable control of the ON/OFF action of the test object)

It has 9 sets of PID parameter settings, with jump and hold functions during program execution, and can display curves and obtain data; Date and time adjustment function; Button and screen lock (LOCK) function, can be connected to a computer for use

Communication RS-232 interface, can be used as a monitoring and remote control system, record test data

Running mode, program mode/fixed value mode

Setting method: Chinese/English interface, touch input

Set the maximum temperature range with upper and lower limits of 5 ℃

Display resolution temperature: 0.01 ℃; Humidity: 0.1%; Time: 1min;

The power-off memory function can set the power-off recovery mode to: hot start/cold start/stop

The scheduled startup function allows for the setting of the startup time at will, and the machine will automatically run when the power is turned on

Input PT100 platinum resistor

The curve recording function has RAM with battery protection, which can save the set values, sampling values, and sampling time of the device; The maximum recording time is 60 days (when the sampling period is 1.5 minutes)

Software usage environment: IBM PC compatible machine, CPU with P Ⅱ or above, 128MB or above memory, Simplified Chinese Windows 2000 or Simplified Chinese Windows XP operating system

Circulating fan, low-noise multi wing centrifugal fan

Imported nickel chromium alloy electric heater

Heater control method: contactless equal period pulse width modulation, SSR (solid-state relay)

Imported nickel chromium alloy electric heater for humidifier

External wetting method

Control method: anti integral saturation PID, BTC balance temperature control method (temperature testing equipment)

BTHC Balanced Temperature and Humidity Control Method (Temperature and Humidity Testing Equipment)

Set range temperature: Adjust according to the temperature working range of the device (upper limit+5 ℃, lower limit -5 ℃)

Input platinum resistor

Supplementary functions

(Standard configuration) Fault alarm and cause, processing prompt function

A fail-safe mechanism 

Upper and lower temperature protection function

9、 Wet heat system water supply

The water quality requirements for water supply must meet the second level water quality standards of the national analytical laboratory, with a solid impurity content of less than 1mg/L in the water

Water supply mode: automatic/manual dual water supply mode

Water supply device 1. The machine is equipped with a small soft water machine filter unit, which only needs to be connected to tap water to automatically produce the required purified water for spraying, effectively preventing impurities in the water quality from adhering to the surface of the sample and affecting the test results; Water supply pressure: 0.1-0.4Mpa

2. PVC large water tank, can be manually refilled when water supply is inconvenient

10、 Safety protection device

Refrigeration system compressor overheating, overcurrent, overpressure, phase loss and phase reversal, oil shortage protection

Cooling water system protection for high water temperature, low water pressure, overload of water pump motor, and overload of cooling fan

Test box extreme overheating, fan, motor overheating relay

Humidification system humidification heating tube dry burning, abnormal water supply, abnormal drainage, and abnormal water shortage protection

Power leakage protection, overload, short circuit, and under reverse phase protection

11、 Packaging and transportation methods

1. Packaging: Transport packaging boxes that meet the requirements of QB/BWD008-2001;

2. Shipping method: Whole machine freight.

12、 Acceptance criteria and third-party verification

1. Acceptance criteria: The technical indicators shall be in accordance with the methods specified in the "Technical Agreement" signed by both parties.

2. Acceptance method: Formal acceptance shall be conducted on the site of the purchaser.

3. If the purchaser needs to invite a third party (verified by the National Environmental Testing Equipment Quality Inspection Center and issued a valid inspection report) to participate in the acceptance before leaving the factory, the cost shall be borne by the purchaser. If the first acceptance is not qualified, the cost incurred during the second acceptance after improvement by the supplier shall be borne by the supplier.

4. The customer entrusts the National Environmental Testing Equipment Quality Inspection Center to conduct calibration on their own.